A Load Balancer is a device or software that distributes network or application traffic across multiple servers. This helps ensure that no single server becomes overwhelmed with too much traffic, which can lead to slow performance or downtime. By balancing the load, it enhances the reliability and availability of applications, making them more efficient. Load balancers can operate at different layers of the network, such as the Transport Layer (Layer 4) or the Application Layer (Layer 7). They can also provide additional features like SSL termination, health checks, and session persistence, improving overall user experience and system performance.